Weighing-scale.



No. 721,998. PATENTED MAR. 3, 1903.

J. W. GARTWRIGHT.

WEIGHING SCALE.

APPLICATION FILED AUG. 1, 1902.

no MODEL. 2 SHEET SSHEET 1.

PATENTED MAR. 3

J. W. GARTWRIGHT. WEIGHING SCALE. APPLIUATION FILED AUG. 1, 1902.

Y0 MODEL.

2 SHEETS-SHEET 2.

40 ms PETERS co mmoumo msnmcnou, nv c.

UNITED STATES PATENT OFFICE.

JOSEPH WVILBRAI-IAM OARTWRIGHT, OF SOUTHPORT, ENGLAND.

WEIGHING-SCALE.

SPECIFICATION forming part of Letters Patent N 0. 721,998, dated March3, 1903.

Application filed August 1,1902. Serial No. 118,001. No model.)

To all whom, it ntay concern:

Be it known that I, JOSEPH WILBRAHAM CARTWRIGHT, a subject of the Kingof Great Britain and Ireland, residing at 53 Lytham road, Marshside,Southport, in the county of Lancaster, England, have invented a new anduseful Improvement in WVeighing-Scales, of which the following is aspecification.

My invention relates to weighing-scales in which the weighing is done bymeans of a combination of weights and a spring.

The object of the invention is to cause the spring to so act that thefractional amounts are indicated on a dial or quadrant, while the unitsare determined by separate weights placed in the weight-pan of thescales.

I will describe my invention as adapted to weigh provisions, forinstance, in pounds and ounces; but I do not confine it to this use orto these denominations of weight.

In the drawings, Figure 1 is a front elevation of a pair of scalesconstructed in accordance with my invention. Fig. 2 is a View of aportion of Fig. 1, but drawn to a larger scale. Fig. 3 is a section ason line a: of Fig. 1 and drawn to the same scale as Fig. 2.

1 is the base-plate, and 2 3 are hollow standards which support acylindrical casing 4, which carries a bracket 5. This bracket 5 hasbearings 6 for the knife-edge 7 of the beam or steelyard composed of twounequal arms 8 and 9.

10 is the scale-pan for the goods, and 11 that for the weights. Theweights are made proportional to the length of the arms 8 and 9.

Near the bottom of casing 4 are bearings 12 for the knife-edge pivot 13of the pointer 14. Said pointer carries a counterweight 15. When thebeam or steelyard moves, the pointer 14 also moves, and this is effectedby a-cord or chain 16, attached at 17 to arm 9, and which has a turnaround a drum 18, said drum being mounted on the same spindle 19 as thepointer 14. A small weight 20 on the other end of cord 16 serves toreturn pointer 14 to zero.

21, Fig. 2, is a pinching-screw to prevent slip of cord 16 on drum 1Sand to allow of setting or adjustment of the pointer.

Standard 2 contains a spiral spring 22, (see Fig. 2,) which isconnected, as by cord 23, with the arm 9 by not 24 or equivalent.

25 is a slot in arm 9 to allow of adjustment in obvious manner.

26 is a dash-pot, which may conveniently contain glycerin and theplunger 27 whereof is connected to arm 9 by rod 28. Its function is toshorten the oscillations when the apparatus is in use.

The mode of action is as follows: Supposing goods of the Weight, forexample, of eight ounces are placed on scale-pan 10, the arm 8 sinks andarm 9 rises, thus pulling on cord 23 and extending spring 22 andoscillating pointer 14. The increasing resistance of spring 22 soonequals the pullon it of cord 23, and the apparatus comes to rest, asclearly shown in Fig. 1. If it be desired to weigh goods of more thansixteen ounces in weight, weights are placed in the pan 11. It will thusbe clear that the pointer indicates fractions of a pound, and weightsare used for one pound or a multiple thereof. In other words, weightsare used for units and the spring for fractions.

What I claim as my invention, and desire to secure by Letters Patent,is-

In weighing-scales having a spring adapted to pull against the goods anda cord adapted to oscillate a pointer when the beam moves, the slot 25whereby the radial positions of the cord and the springmay be adjusted,substantially as described and shown.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

JOSEPH WILBRAIIAM CART WRIGHT.

W'itnesses:

CHAS. COVENTRY, FRANK QUAIL;

